在将新记录插入打字稿中的其他模型之前检查 Sequelize 模型中的值

Question

我有如下三个Sequelize模型：

User (userId, userName, moneyInWallet)
Product (productId, productName, price)
Purchase (purchaseId, buyingUser, quantity, dateOfPurchase)

我现在想在打字稿中编写一个 'post' 方法，仅当 'User' 模型中用户的 'moneyInWallet' 更大时，才将记录插入 'Purchase' 模型比来自 'Product' 型号的产品的 'price' 如：

purchaseController.post('/add/',
    (req: Request, res: Response) => {
/* logic here*/
})

有人可以帮我解决这个问题吗...

提前致谢！！

Answer 1

只需解码来自 post 请求的数据 how

然后找到用户和产品。检查您的逻辑并创建新的购买。发回你需要的东西，通常是新物品的 id

它将是这样的：


const {User, Product, Purchase} = require("/path/to/models");
app.use(express.json());  // to decode post body json data

purchaseController.post('/add/',
    async (req: Request, res: Response) => {
      try{
        const { 
          userId, 
          productId,
          quantity,
        } = req.body;

        const user = await User.findOne({where: {userId}});
        const product = await Product.findOne({where: {productId}})

        if(user && product && user.moneyInWallet > product.price * quantity){
            const {purchaseId} = await Purchase.create({
              //purchaseId - should by autocreated
              buyingUser: userId 
              quantity 
              // dateOfPurchase - should by autocreated 
            })
            if(purchaseId == undefined){
              res.status(500)// or some other bad code
              res.send("unable to create purchase record in database")
            } else {
              res.json({
                purchaseId
              })
            }
        } else {
            res.send("user product not finded or user don't have enough money")
        } 
      } catch(error){
          res.status(500)// or some other bad code
          res.send(error.message)
      }
})

在将新记录插入打字稿中的其他模型之前检查 Sequelize 模型中的值

Check values in a Sequelize models before inserting a new record to other model in typescript

post

sequelize.js

typescript